Newton's laws

• What do forces always come in according to Newton's Third Law?

  Forces always come in pairs.
• What is the effect of net force Fnet on the wagon in the diagram?

  It causes acceleration 'a'
• How do the forces acting on the system in part (a) differ from those in part (c)?

  • In part (a), the forces are F1, F2, W, and N
  • In part (c), the forces are Fadult and N
• What is the formula to calculate the net force (Fnet) acting on the system?

  Fnet = F1 + F2
• If a ball is on a table, what will happen if no external force acts on it?

  The ball will remain at rest.
• How are the two forces in Newton's Third Law related?

  • The two forces are equal in magnitude
  • The two forces are opposite in direction
• How does mass affect acceleration according to Newton's Second Law?

  Mass is inversely proportional to acceleration
• What are the key implications of Newton's First Law (Law of Inertia)?

  • Objects at rest remain at rest.
  • Objects in motion remain in motion.
  • Change in motion requires an external force.
• In the provided diagram, what do forces F1 and F2 represent?

  They combine to create net force Fnet
• If you push on a wall with a force of $10\text{ N}$, what is the force the wall exerts back on you?


  $10\text{ N}$
• What is the name of the diagram shown in the image?

  Free-body diagram
• How does pushing a shopping cart compare to pushing a car?

  Pushing a car requires more force
• What does Newton's Second Law state about acceleration?

  Acceleration is directly proportional to force
• What does Newton's Third Law state?

  For every action, there's an equal reaction.
• What is the term for the total force acting on an object?

  Net force
• How does Newton's Third Law relate to the concept of action and reaction forces?

  • The force you apply (action) is met with an equal and opposite force from the wall (reaction)
  • Action and reaction forces always come in pairs
  • Action and reaction forces are equal in magnitude but opposite in direction
• What are the two forces described in Newton's Third Law?

  • Force 1 (F1): You push on a wall
  • Force 2 (F2): The wall pushes back
• What are the forces acting on the system in the free-body diagram?

  • Normal force (N)
  • Weight force (W)
  • Force 1 (F1)
  • Force 2 (F2)
  • Net force (Fnet)
• What is Newton's Third Law?

  Forces always come in pairs: You push on a wall, the wall pushes back
• What are the key concepts of Newton's Third Law?

  • Action and reaction forces are equal.
  • Forces come in pairs.
  • Forces act on different objects.
• What determines an object's acceleration according to Newton's Second Law?

  The net force acting on the object
• What is the relationship between force, mass, and acceleration in Newton's Second Law?

  • Acceleration is directly proportional to force
  • Acceleration is inversely proportional to mass
  • Net force determines acceleration
• What do Newton's Laws reveal about forces and motion?

  • Forces interact to influence motion
  • They explain everyday phenomena
  • They are fundamental to understanding physics
• What does Newton's First Law state about an object in motion?

  An object in motion stays in motion.
• What is the application of Newton's First Law when riding a bike?

  You keep moving until friction slows you down
• What is the direction of the normal force (N) in the free-body diagrams?

  Upward
• How do action and reaction forces act according to Newton's Third Law?

  They act on different objects.
• What does Newton's First Law state about an object at rest?

  An object at rest stays at rest.
• What happens when you push on a wall according to Newton's Third Law?

  The wall pushes back with equal strength.
• What happens to a rolling ball according to Newton's First Law?

  It continues rolling until acted on by a force.
• What is the action in Newton's Third Law when swimming?

  You push backward on the water
• What is required for an object to change its state of motion according to Newton's First Law?

  An external force must act on it.
• What does Newton's Second Law state about heavier objects?

  They require more force to accelerate
• What external force might stop a rolling ball?

  Friction or an obstacle can stop it.
• What is the reaction when you push backward on the water while swimming?

  The water pushes you forward